Error on booting Live USB

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Welcome to Manjaro forum @joanters

Kernel 6.18.18 was included in Manjaro 26.0.4 ISOs released 2026-03-27

Try using 26.1 pre-release ISO released 2026-05-27 (with kernel 7.0.10)
Manjaro 26.1 Bian-May - Preview released